Troubleshooting of Lenovo Zhaoyang e42-80 notebook without backlight

Troubleshooting of Lenovo Zhaoyang e42-80 notebook without backlight

Lenovo Zhaoyang e42-80 laptop turned on without backlight, the bridge sent a signal to the screen to open without VCC, so the screen interface 15 pin 16 pin was connected to 16 pin 3.3V booting up, and the fault was repaired.

Machine model: Lenovo Zhaoyang e42-80 notebook

Plate No.: ：DA0LV6MB6F0

Fault phenomenon: turn on the dark screen, there is a picture.

Maintenance process: replace the screen fault, remove the machine to check the line cn7 screen interface lcdvcc 3.3V normal, 15 pin vadj_PWM backlight adjustment VCC is normal.

Lenovo Zhaoyang e42-80 notebook boot dark screen no backlight maintenance Figure 1

Lenovo Zhaoyang e42-80 notebook power on dark screen without backlight maintenance Figure 2

Lenovo Zhaoyang e42-80 notebook power on dark screen without backlight maintenance Figure 3

Lenovo’s maintenance picture of no backlight notebook of Zhaoyang E42

1-pin 2-pin gfx_ PWR_ SRC 19v power supply is normal, 16 pin dispon power supply 0.22V is abnormal, the problem comes, 16 pin dispon power supply 0.22V is abnormal PCH_ LVDS_ BLON———–DISPON 。

Lenovo Zhaoyang e42-80 notebook boot dark screen no backlight maintenance Figure 4

Lenovo Zhaoyang e42-80 notebook boot dark screen no backlight maintenance Figure 5

Lenovo Zhaoyang e42-80 notebook power on dark screen without backlight maintenance Figure 6

The bridge signals the screen to open without VCC.So the screen interface 15 pin 16 pin is connected to 16 pin 3.3V booting up, and the fault is repaired.

Lenovo Zhaoyang e42-80 notebook boot dark screen no backlight maintenance Figure 7